Question

The mean of the age of three students Vijay, Rahul and Anu is $15years$. If their ages in the ratio $4:5:6$ respectively, then their respectively ages are

• A. $12years,15years,18years$
• B. $12years,18years,15years$
• C. $18years,15years,12years$
• D. $15years,12years,18years$

Answer 1

Answer: (A)

$12years,15years,18years$

Given ratios

$4:5:6$

Let the age of three students Vijay, Rahul and Anu is $x$.

$4x+5x+6x=15\times 3$

$15x=45$

$\therefore x=3$

$\begin{array}{c}\Rightarrow 4x=4\times 3=12\\ \Rightarrow 5x=5\times 3=15\\ \Rightarrow 6x=6\times 3=18\end{array}$

Then,

Option $A$ is correct answer.